Use SSML tags to personalize text-to-speech in Amazon Polly
When you add a prompt to a flow, you can use SSML tags to provide a more personalized experience for your customers. SSML tags are a way to control how Amazon Polly generates speech from the text you provide.
The default setting in a flow block for interpreting text-to-speech is Text. To use SSML for text to speech in your flow blocks, set the Interpret as field to SSML as shown in the following image.